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GATES & FRASER.

- Stamping Machine.

No. 28,807. Patented June 19, 1860.

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UNITED STATES PATET GFFIC.

PHILETUS \V. GATES AND D. R. FRASER, OF CHICAGO, ILLINOIS, ASSIGNORS TO THEMSELVES AND THOMAS CHALMERS, OF SAME PLACE.

MACHINE FOR STAMPING METAL QUARTZ.

To all whom it may concern:

Be it known that we, PI-IILETUs .V. GATES and DAVID R. FRASER, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Machines for Stamping Metal Quartz; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in which- Figure l, is a vertical longitudinal section of our improved stamping machine. Fig. 2, is a vertical transverse section of the same. Fig. 3 is a detached transverse section in the line :0, 0c, and Fig. 4, is a detached longitudinal section in the line 1 y.

Similar letters of reference, in each of the several figures indicate correspol'zding parts.

The nature of our invention consists. first, in the combination of a toothed and collared rising and falling power-bar, or its equivalent, with a combined plain and toothed lifting device, whereby a gradual and easy movement is secured, for the purposes hereinafter stated; second, in so constructing, and arranging the lifting device on its shaft, that it ceases its connection with said shaft at a certain stage of the revolution of the same, and at the same time, instantly, by its gravity, travels at a quicker speed than the shaft, and thus escapes being arrested by the descending bar; third, in the combination of two eccentric gears, toothed and collared power bar, and the combined lifting device; whereby an easy, but gradually accelerating movement is secured; fourth, in the combination with the inclined screens of tliecmortars, of the overhanging shields or guards; whereby while the discharge of the pulverized material is facilitated, the screens are rotected from in'urv caused b lar 'e particles of quartz coming in contact with them. i

To enable others, skilled in the art, to

make and use our invention, we will proceed to describe its construction and operation.

In the drawing, we have shown an ordinary stamping and lifting device in order to make more evident the advantages of our improved arrangement. The ordinary stamp, however, has its collar secured after our improved plan; In practice, for stamping quartz, we place two or more stamps in the same frame and work them by means of a series of lifters on one shaft, but in order to facilitate the description we shall only refer to the machine as employing one stamp.

A, is the frame of a stamping machine.

B, is the stem or lifter, having a stamp C, on its lower end.

D, is a collar made fast to the stem of the stamp by means of a screw thread E. The screw thread is formed on the stem and is to prevent the collar D, which is furnished with a female screw thread on its inner circumference, from falling down.

F, is a, piece of the female screw fitted to a space cut in the inner circumference of the collar so as to admit the key D, behind it and thus prex ent any injurious contact of the same with the thread E.

G, are teeth or cogs formed on the stem of the stamp for a segmental cog wheel H, to work into to raise the stamp. The cogwheel H, with a cam I, attached fast to one side of it, forms the lifting device. This lifting device is fitted loosely on a transverse shaft J, but compelled, by means of a stop K, on the shaft and a stop L, on the cam, to turn with said shaft from the commencement.- of the lifting operation to the completion of the same, when itceases its connection with the shaft and instantly falls back so as to escape from the descending stamper. The cam lifts the stamp first, by taking hold of the collar D, and as the stamp rises the cog-segment gradually gears with the cogs of the stem B, and continues the elevation of the stamp until the full movement is ac complished, when the stamp falls.

M, M, are two eccentric gear Wheels, to give a gradually accelerating motion to the lifting device, so that as it first takes hold of the stamp, it shall lift it slowly a certain distance or until the cogged segment gears with the cogged stem.

N, is a mortar, its sides and ends a, a, are inclined so as to facilitate the flow of pulverized quartz through the screens P, P, said screens regulating the fineness of the quartz.

N, N, are shields to prevent the larger particles of quartz from injuring the screens O, is a catch to hold up the stamp when it is necessary to clean out the mortar.

Q, Q, are the (1183 forming the bottom of the mortar. These dies are beveled off at cl, (Z, so that they overlap one another where they oin and consequently cannot be forced down so ti htly as to be difiicult of removal.

Instead of using a separate section F, of a female screw in confining the collar to the stem of stamp a key seat may be cut in the screw thread of the shaft, as shown at 0.

The operation is as follows: Power being applied to the driving shaft 6, the cam of the lifter comes under the collar and lifts the stamp with a motion so slow that no injurious sudden jarring of the machinery is experienced. The cam leads the segment wheel into gear with thecogs or rack on the stem of the stamp and thus prevents sudden injurious contact at this stage of operation; the wheel being brought in gear raises the stamp without much friction and with a gradually accelerating motion, some three or four feet, more or less, accordingly as the collar is set on the stem. The collar on the stem is adjusted to a position in relation to the lifting device, as may occasionally be necessary, by reason of wear, by withdrawing the key and turning the collar on the screw. lVhen the collar is thus adjusted, and the key inserted the jarring of the stamp when it falls, does not loosen the collar, as is the case when simply a key without a screw is used, and therefore much loss is prevented, as the collar cannot fall down to a position which will endanger the breaking of the machinery when the lifter comes in contact with it. V] hen the stamp descends, it comes in contact with the quartz in the mortar and pulvcrizes it, and the pulverized material being driven up by the force of the blow falls upon the inclined sides of the mortar and screen and passes out easier and faster than if the sides were vertical as they have usually been made.

As the quartz flies onto the inclined sides, the larger particles strike the shield N, N, and thus the screens are protected from any injurious contact of the same. The shields being perforated with holes sufficiently large to allow the smaller particles to fall through upon the screen, nothing is lost by their use. When it is necessary to clean out the mortar, the collar of the stamp is suspended on the catch, and owing to being thus suspended, the engine and part of the machinery may be kept in motion.

Our improvements are especially adapted to quartz-stamping machines, but it is obvious that their use is not necessarily limited to such machines; for in forge-hammers, drop-presses, pile-drivers, &c. it is very essential to have a lifting device which 0perates substantially as we have set forth.

Vhat we claim our invention and desire to secure by Letters Patent, is

1. The combination of a toothed and collared rising and falling power bar D, G, or its equivalent, with a combined plain and toothed lifting device H, I, substantially as and for the purposes set forth.

2. The manner substantially as specified, of arranging the lifting device on its shaft, for the purposes set forth.

3. The combination of two eccentric gears M, toothed and collared power-bar D, G, and the combined. lifting device H, I, substantially as and for the purposes set forth.

at. The combination with the inclined screens P, P, of the mortars, of the overhanging shields or guards N, N, substantially as and for the purposes set forth.

PHILETUS N. GATES. DAVID R. FRASER.

Witnesses:

A. G. TVARNER, J. L. FARGO. 

